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willy
PostPosted: Sun Sep 18, 2011 10:19 pm 
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Are these flat top 998 pistons able to be machined to suit a 1098 build, or is there insufficient crown to the piston?

I know GR pistons are flat top and he does ones to suit 1098, but am just looking at possible alternatives.
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drmini in aust
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PostPosted: Sun Sep 18, 2011 10:24 pm 
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998 pistons (some) have been shortened in the past to fit 1098s.
I think you will find them a bit thin down to the top ring, after you take 3.75mm off them (1/2 the 7.5mm stroke difference).
Also remember they go down further, so you will have to shorten the skirts.

GR's 1098 ones have the right crown height, but beware they are a bit long- they foul on the dizzy driveshaft unless you thin it down in diameter, or shorten the piston skirts.
[edit] Not sure if this is still the case, but it was an issue last year. Ask Graham...

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


Last edited by drmini in aust on Mon Sep 19, 2011 8:08 am, edited 1 time in total.

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willy
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PostPosted: Sun Sep 18, 2011 10:39 pm 
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How ridiculous is the fact that the pistons he has had made foul the dizzy drive.
That's just madness.

:?
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Wombat
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PostPosted: Mon Sep 19, 2011 8:07 am 
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I put one of his first batch of +100 flat tops in the 1100 - tearing my hair out trying to work out what was wrong but was a simple fix getting the dizzy drive turned down into a little dumbbell

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Super-mini
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PostPosted: Mon Sep 19, 2011 10:12 am 
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tell us more about your smallblock willy
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willy
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PostPosted: Mon Sep 19, 2011 4:44 pm 
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Super-mini wrote:
tell us more about your smallblock willy


Soon, soon!
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Mick
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PostPosted: Mon Sep 19, 2011 4:47 pm 
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Location: Under the bonnet son!
I'm excited willy!

The underground movement of small bore lovers is gaining momentum..

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adamstuart
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PostPosted: Mon Sep 19, 2011 4:56 pm 
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Mick wrote:
I'm excited willy!

The underground movement of small bore lovers is gaining momentum..


998 love!

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NG
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PostPosted: Mon Sep 19, 2011 6:40 pm 
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Super-mini wrote:
tell us more about your smallblock willy


hmm lol lol :lol:
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willy
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PostPosted: Tue Sep 20, 2011 6:43 pm 
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Super-mini wrote:
tell us more about your smallblock willy


This engine is going to be built by an SA A-series master, with years of Historic racing experience.

Details to follow.
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74snail
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PostPosted: Tue Sep 20, 2011 8:43 pm 
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Mick wrote:
I'm excited willy!

The underground movement of small bore lovers is gaining momentum..


And the best ones are a 998 block with a 850 thicktail crank and about 140thou off the top of the block , its almost the same recipe as the European Turbo 850's

.

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Super-mini
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PostPosted: Tue Sep 20, 2011 8:53 pm 
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willy wrote:
Super-mini wrote:
tell us more about your smallblock willy


This engine is going to be built by an SA A-series master, with years of Historic racing experience.

Details to follow.


I like the sound of that
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kirby
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PostPosted: Tue Sep 20, 2011 8:55 pm 
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74snail wrote:
And the best ones are a 998 block with a 850 thicktail crank and about 140thou off the top of the block , its almost the same recipe as the European Turbo 850's

.


What is this thicktail 850 crank you speak off?
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drmini in aust
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PostPosted: Tue Sep 20, 2011 9:00 pm 
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Early 850 cranks were only 1-3/8" diameter. Around 1964? they increased it to 1.5" the same as 998 & 1098.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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74snail
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PostPosted: Tue Sep 20, 2011 9:12 pm 
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drmini in aust wrote:
Early 850 cranks were only 1-3/8" diameter. Around 1964? they increased it to 1.5" the same as 998 & 1098.


:D I can just imagine now all the people out in the shed with the old 850 motor,s that were going to the tip stripping them to measure the crank , just remember you need custom thrusts ( bearings )

.

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